In a large bowl mix brownie mix, water, coffee, vegetable oil, eggs, salt. Grease a 13x9 baking dish (even if it's non stick) or line bottom and sides w/ parchment paper). Pour in 1/2 the batter. In a small bowl add chocolate chips and flour. Stir to coat the chips in flour and sift. Sprinkle chips around the 1st layer of batter. Add the remaining 1/2 of batter.

Heat the peanut butter in a microwave for about 30 seconds. Spoon peanut butter in vertical lines over the top of the brownie batter. With a toothpick or skewer, vertically go in circles mixing the peanut butter and the brownie batter to form a circular design.

Bake in a 325 degree oven for about 40-45 minutes. After 40 minutes keep checking center of brownies w/ a toothpick to make sure it comes out clean. Ovens vary so it may be a few more minutes.

Let cool at least 1/2 hour before you cut and serve. They are pretty rich and fudgy so I usually cut into about 1 inch cubes. Also good served with vanilla ice cream or frozen yogurt.